<template>
  <header class="header">
    <h1>todos</h1>
    <input id="toggle-all" class="toggle-all" type="checkbox" >
    <label for="toggle-all"></label>
    <input
      class="new-todo"
      placeholder="输入任务名称-回车确认"
      autofocus
      v-model.trim="title"
      @keyup.enter="onKeyUp"
    />
  </header>
</template>

<script>
export default {
  data () {
    return {
      title: ''
    }
  },
  methods: {
    onKeyUp () {
      if (this.title === '') return alert('严肃点儿，在写作业呢！')
      this.$emit('on-add', this.title)
    }
  }
}
</script>
